SIGN
The SIGN
function returns the sign of Expression
.
SQL syntax
SIGN (Expression
)
Parameters
SIGN
has the parameter:
Parameter | Description |
---|---|
|
Operand or column can be any numeric data type. |
Description
-
If
Expression
is of typeNUMBER
, the data type returned isNUMBER
with maximum precision and scale. Otherwise, the data type returned isTT_INTEGER
.For numeric types that are not binary floating-point numbers, the sign is:
-
-1 if the value of
Expression
is<0
-
0 if the value of
Expression
is= 0
-
1 if the value of
Expression
is> 0
-
-
For binary floating-point numbers (
BINARY_FLOAT
andBINARY_DOUBLE
), this function returns the sign bit of the number. The sign bit is:-
-1 if the value of
Expression
is<0
-
+1
if the value ofExpression
is>= 0
or the value ofExpression
is equal toNaN
-
Examples
These examples illustrate use of the SIGN
function with different data types. Table signex
has been created and the columns have been defined with different data types. First, describe the table signex
to see the data types of the columns. Then select each column to retrieve values for that column. Use the SIGN
function to return the sign for the column.
Command> DESCRIBE signex; Table SAMPLEUSER.SIGNEX: Columns: COL1 TT_INTEGER COL2 TT_BIGINT COL3 BINARY_FLOAT COL4 NUMBER (3,2) 1 table found. (primary key columns are indicated with *) Command> SELECT col1 FROM signex; < 10 > < -10 > < 0 > 3 rows found. Command> SELECT SIGN (col1) FROM signex; < 1 > < -1 > < 0 > 3 rows found. Command> SELECT col2 FROM signex; < 0 > < -3 > < 0 > 3 rows found. Command> SELECT SIGN (col2) FROM signex; < 0 > < -1 > < 0 > 3 rows found. Command> SELECT col3 FROM signex; < 3.500000 > < -3.560000 > < NAN > 3 rows found. Command> SELECT SIGN (col3) FROM signex; < 1 > < -1 > < 1 > 3 rows found. Command> SELECT col4 FROM signex; < 2.2 > < -2.2 > < 0 > 3 rows found. Command> SELECT SIGN (col4) FROM signex; < 1 > < -1 > < 0 > 3 rows found.